What would really help here is screen shots of what you are seeing when you cannot access the forums. Then, if you can, run a trace route to 'www.grandprixforums.net', 'www.tagpc.net'(local chapter here) and then maybe something like 'www.bransongpmeet.com' and post screen shots results of each.
This has been a tricky issue to run down and is going to require a bit more effort than the typical issue. So anything anyone can do with regards to the above information would be helpful in isolating the issue.
